Abstract: An internal combustion engine having a pair of opposed ignition pistons and a pump element that reciprocates coaxially in opposition to the pistons. A pair of counterbalance arms are linked to the pump element to also reciprocate in opposition to the pistons. A counterbalance linkage includes rocker arms which are pivotally connected to the housing and which are pivotally and slidably connected to the pump element and the pistons. The engine includes a pair of opposed combustion pistons which reciprocate in synchronism with the ignition pistons and a manifold supplies an ignited fuel/air charge from the ignition to the combustion pistons.

Abstract: An opposed piston engine includes pistons mounted at opposite ends of a piston rod which is pivotally coupled to one end of a rocker arm coupling the piston rod to a connecting rod in turn coupled to an eccentric drive mechanism. The rocker arm is pivotally coupled to the engine block by pivot means permitting necessary lineal movement of the rocker arm during operation. Counterbalance arms are pivotally coupled to the engine block at one end and include weighted portions positioned to provide counterbalancing for the opposed pistons. Pivot means couple the rocker arm and the counterbalance arms for providing the desired relative motion between these elements. A hollow drive shaft is coupled to the eccentric drive mechanism and a transmission shaft extends through the drive shaft to permit positioning of a clutch at one end of the engine and the transmission at the other.

Abstract: An opposed piston engine includes pistons mounted at opposite ends of a piston rod which is pivotally coupled to one end of a rocker arm coupling the piston rod to a connecting rod in turn coupled to an eccentric drive mechanism. The rocker arm is pivotally coupled to the engine block by pivot means permitting necessary lineal movement of the rocker arm during operation. Counterbalance arms are pivotally coupled to the engine block at one end and include weighted portions positioned to provide counterbalancing for the opposed pistons. Pivot means couple the rocker arm and the counterbalance arms for providing the desired relative motion between these elements. A hollow drive shaft is coupled to the eccentric drive mechanism and a transmission shaft extends through the drive shaft to permit positioning of a clutch at one end of the engine and the transmission at the other.